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74AC191MTC датащи(PDF) 1 Page - Fairchild Semiconductor

номер детали 74AC191MTC
подробное описание детали  Up/Down Counter with Preset and Ripple Clock
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производитель  FAIRCHILD [Fairchild Semiconductor]
домашняя страница  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

74AC191MTC датащи(HTML) 1 Page - Fairchild Semiconductor

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© 1999 Fairchild Semiconductor Corporation
DS009940
www.fairchildsemi.com
November 1988
Revised November 1999
74AC191
Up/Down Counter with Preset and Ripple Clock
General Description
The AC191 is a reversible modulo 16 binary counter. It fea-
tures synchronous counting and asynchronous presetting.
The preset feature allows the AC191 to be used in pro-
grammable dividers. The Count Enable input, the Terminal
Count output and the Ripple Clock output make possible a
variety of methods of implementing multistage counters. In
the counting modes, state changes are initiated by the ris-
ing edge of the clock.
Features
s ICC reduced by 50%
s High speed—133 MHz typical count frequency
s Synchronous counting
s Asynchronous parallel load
s Cascadable
s Outputs source/sink 24 mA
Ordering Code:
Device also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering code.
Logic Symbols
IEEE/IEC
Connection Diagram
Pin Descriptions
FACT
 is a trademark of Fairchild Semiconductor Corporation.
Order Number
Package Number
Package Description
74AC191SC
M16A
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150” Narrow Body
74AC191SJ
M16D
16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74AC191MTC
MTC16
16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
74AC191PC
N16E
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide
Pin Names
Description
CE
Count Enable Input
CP
Clock Pulse Input
P0–P3
Parallel Data Inputs
PL
Asynchronous Parallel Load Input
U /D
Up/Down Count Control Input
Q0–Q3
Flip-Flop Outputs
RC
Ripple Clock Output
TC
Terminal Count Output


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